Two analytes A and B have retentioin times of 13.5 min and 19.5min, peak widths of 2min and 2.8min for a mobile phase composition of 20% methanol and 80% H2O on a 15cm C18 column which has a dead time of 1.5min.
Determine the composition of methanol and H2O at which the capacity factor for A becomes 2. What is the capacity factor of B at this new composition?